"I was sleeping in my bed and heard a noise several nights in a row. One day my husband said, 'Hit the window and it will go away.' I hit the window and looked out and he's looking right back at me, not five inches from my face and said, 'I'm watching you,'" she said.

Dolton said she didn't realize the man outside her window was a neighbor.

"I saw his face so I watched every delivery guy, pizza guy, UPS guy, mailman come up and down until I saw him and then I wrote his license plate down when I saw him and took it to the police," she said.

In September 2007, court records show Cancilla was found guilty of a disorderly conduct summary offense.

"The magistrate asked him, 'This picture looks like you. What do you have to say about that?' He said, 'I'm guilty.' He said, 'You have a fine to pay,' and how much it was, and he said, 'I'll pay it all in full, right now, today,'" Dolton said.

District Judge Mark Mansour also released state police search warrants Friday that police used to search Cancilla's apartment. In the affidavit of probable cause, an eyewitness described watching Cancilla shoot Christina White and her boyfriend Timothy Reffner.

"...as he was leaving, he heard yelling and screaming occurring inside of building F of Hempfield Heights Apartments. The witness then observed two individuals running from building F and another individual following behind them with a firearm in his hand, actively shooting at the two individuals. The witness also related that the actor appeared to have an object in his other hand. The witness then related that he then observed both victims fall to the ground," the affidavit states.

The witness told police he went into his vehicle and hid. Then, he said he heard additional gunshots and saw Cancilla turn around and run back into building F.

Police said Cancilla had a long-standing feud against White and Reffner. He lived in the apartment directly beneath theirs and often complained to apartment management about the upstairs tenants being too loud. The final complaint, police said, was Nov. 3 when White, Reffner and Cancilla were all given verbal reprimands by apartment management.

After Wednesday's shooting, police said they found Cancilla dead of a self-inflicted gunshot wound. He left a note on a yellow post-it that read, "Can only be provoked for so long before exploding."